Testing a hypothesis using a series of steps with controlled conditions is called a

amber has allowed scientists to study dna that has been preserved over millions of years.

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !